NL4 6max AK TPTK facing turn chk/raise

Preflop: Standard I think
Flop: Again, standard 2/3rds bet onto a not very scary board

Turn: I feel like I need to bet for value here I'm ahead a lot. SB's raise looks quite strong and I opt for a fold because I'm not sure what hands he does this with that I can beat and if I call this raise I have a more difficult river decision. Or is folding here too weak?

Thanks!

OnGame - $0.04 NL (6 max) - Holdem - 4 players
Hand converted by PokerTracker 4

Hero (CO): 172 BB
BTN: 103.75 BB (VPIP: 17.50, PFR: 10.00, 3Bet Preflop: 6.25, Hands: 40)
SB: 99.5 BB (VPIP: 20.00, PFR: 20.00, 3Bet Preflop: 0.00, Hands: 6)
BB: 177.5 BB (VPIP: 17.46, PFR: 14.29, 3Bet Preflop: 0.00, Hands: 67)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K♥ A♦

Hero raises to 3 BB, fold, SB calls 2.5 BB, fold

Flop: (7 BB, 2 players) 8♥ Q♠ K♣
SB checks, Hero bets 5.5 BB, SB calls 5.5 BB

Turn: (18 BB, 2 players) 5♠
SB checks, Hero bets 13.5 BB, SB raises to 33.25 BB, fold

SB wins 42 BB